Loop-spreader for sewing-machines.



E. ERICKSON.

LOOP SPREADER FOR SEWiNG MACHINES.

APPLICATiON FILED JULY 1?. 19:4.

Patented spt. 21, 1915.

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COLUMBIA PLANOGRAPH c0, WASHINGTON, D, c.

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EDWARD ER-ICKSON, QFLYNN, MAssAoHUsET'rs, ASSIGNOR 'ro VICTOR- snon MACHINERY cop, 0F nos'rou, MASSACHUSETTS, A CORPORATION or .MASSA- cans-arms.

Specification of Late-s Patent.

LOOP-SPREADER roe SEWING-MACHINES. V I

Patented Sept. 21, 1915.

ApplicationfiledJu1y17, 1914. seria uassegoee. I

T 0 (NZ whom "it ma concern Be it known that'l, EDWARD ETHICKSON, a subject of the King of Swedemand a resident of Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Loop-Spreaders for Sewing-Machines, of which the following is a specification.

This invention relates to shoe sewing machines, and more particularly to" the loop spreader employed on such machines to.

spread the loop formed by the needle so that it may be engaged by the nose of the shuttle to form the usual lock-stitch.

The object of theinvention is to provide a new and improved mechanism for actuating the loop spreader which will be eflica cious in operation, simple in structure, and

not liable to become inoperative by the wear incident to constant use.

Of the drawings, Figure 1 is an elevation of a portion of a shoe sewing machine having the present invention embodied therein, and Fig. 2 is a section on the line 22 of Fig. 1.

Similar characters designate like parts throughout the several figures of the drawings.

In the drawings, Fig. 1 represents a part of a lock-stitch sewing machine which may be and preferably is as illustrated and described in a co-pending application, Serial No. 739,056, filed by the present inventor on December 28, 1912, to which reference may be had for a more complete description of the details of construction nonessential to the present invention. It is to be understood, however, that the invention may be equally well applied to various other sewing machines of the general type illustrated in said application. The machine of said application comprises a fixed side frame 10, a main cam shaft 11 suitably mounted there in, a shuttle 12 mounted to oscillate in a shuttle carrier 13, and a needle 14 having the usual needle guide 15 and needle carrier 16. The needle is oscillated about its pivot 17 to cause it to penetrate the work and to withdraw carrying a loop of thread. The loop is spread so as to be engaged by the shuttle nose 18 by a hook-like finger 19 on the end of an arm 20. The arm is adjust-ably secured,as by a clamp screw 21, to the end of a rock shaft 22 mounted in lugs 23 and 24 projecting from the side frame 10.

p The rear end of the rock shaft is provided with a T-shaped head 25, the cross member 26of which is bored to loosely embrace a stud 27'mounted for universal movement, by

means of a ball and socket joint'28, in the upper endof an eccentric link 29, the lower end ofwhich embraces an eccentric 30 fixed on the main shaft 11. As shown in Fig. 2, this construction provides for the lateral movement of the spreader arm 20', by which the needle to the plane of the shuttle. It is desirable that the finger 19 shall travel in an approximately elliptical path in order that the finger may be correctly positioned to take theloop from the needle, to deliver it to the shuttle and then to move into position to avoid interference with these members while it returns to its initial position. This movement is produced by providing a pivot on which the eccentric link 29 oscillates, which pivot is preferably movable with the link. A screw 31 passes through a hole near the middle of the link 29, and is threaded into the end of a link 32, the other end of which is pivotally mounted at 33 on the side frame 10., In this manner the rock shaft 22 is not only oscillated by the eccentric 30 but also moved longitudinally which imparts a generally elliptical movement to the finger 19. By proper relation between the screw 31 and the shaft 11, the finger 19 takes the loop from the needle when in a position approximately indicated in dotted lines at a, delivers the loop to the shuttle nose when in about the full line position, and then returns in a plane indicated by the dotted position b. The throw of the eccentric 30 and the distance from the shaft 22 to the ball and socket oint 28 is such as to produce the necessary lateral movement to the finger.

It is apparent that the mechanism described providesa loopspreader actuated from a single moving part, such as the eccentric 30, which produces an elliptical path of travel in the loop-engaging finger. The relation of the eccentric link 29 with the rock shaft 22 and the relative position of the pivot 31 of the link may be varied as the other parts of the machine may demand.

While the described embodiment of the invention is the best form at present known to the inventor, it is to be understood that the invention is not limited to the exact details of construction herein set forth'except in so far as is specified in the appended claims. I

Having thus described my invention, I claim:

1. In a sewing machine, the combination of a needle, a loop spreader, an eccentric, a link actuated thereby, a pivot for the link intermediate said eccentric and its outer end, and connections between the outer end of said link and the spreader.

2. In a sewing machine, the combination of a needle, aloop spreader, a rock shaft to carry the spreader, an eccentric; a link actuated thereby movable in a plane at an angle to the plane of the rock shaft, and connections between the link and the rock shaft.

3. In a sewing machine, the combination of a needle, a rock shaft, a spreader actuated by the rock shaft to open the loop on the needle, an eccentric, a link. connecting the eccentric and the rock shaft, and a pivot for the link whereby the rockshaft is moved longitudinally.

I. In a sewing machine, the combination of a needle, a rock shaft mounted to slide longitudinally, a spreader secured to the rock shaft to open the loop on the needle, a stud carried by the rock shaft and at an angle thereto, an eccentric, a link connecting the eccentric and the stud, and a pivot on the link whereby the rock shaft is moved longitudinally.

5; In a sewing machine,.the combination of a needle, a rock shaft mounted to slide longitudinally, a spreader secured to the rock shaft to open the loop on the needle, a

stud carried by the rock shaft and at an angle thereto, an eccentric, a link connecting the eccentric and the stud, and a link pivotally connected at one end to said eccentric link and having its opposite end pivoted on a fixed part of the machine. I

Signed by me at Boston, Mass, this 18th day of June, 191 i.

EDWARD ERICKSON.

IVitnesses EDWARD F. ALLEN, VALTER E. LoMBARn.

Copies of' this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. I 

